VOLUME
2 1, N O . 1, J A N U A R Y
1949
9A
Announcing THE BECKMAN MODEL "B" SPECTROPHOTOMETER
ADVANCED FEATURES DESIGNED INTO THE MODEL " B "
INCLUDE... CONVENIENCE: Direct reading wavelength scale . . . 320 to 1000 millimicrons . . . readings reproducible t o great accuracy. Direct reading transmission and absorbance (optical density) scales on large easily-read meter. Continuously variable slits for smooth, precise settings. 4-Position sensitivity multiplier permits readings to be made on most advantageous portion o f scale. t Four position cell carriage permits quick positioning of any of 4 cells by an external control.
ACCURACY: Photometric accuracy to 0 . 5 % transmission or 1 % absorbance. N e g l i g i b l e stray light—stray light effects completely eliminated between 360 and 1000 millimicrons . . . less than 1V2% even at 320 millimicrons. Resolution—permits less than 5 millimicron band width over most of spectral range. VERSATILITY: Liquid, solid and gaseous samples may be analyzed. Monochromatic light beam is easily brought outside the instrument for long path measurements and special uses. Accommodates large cells up to 50 m. m. path length in standard cell carrier. Interchangeable photocells—red or blue-sensitive to utilize the high resolving power of the Model " B " . Easily-attached Model " B " accessories w i l l be available for special types o f measurements and for added convenience and accuracy. Write for details.
Nofc simplicity of confro/s. A/so note the sloping panel that permits easy readability of scales from both sitting and standing positions.
The new Model " B " Spectrophotometer is by far the outstanding routine instrument available. It provides advancements pioneered in the Beckman Quartz and Infrared Spectrophotometers but never before offered in a low priced instrument. These advantages are important because they combine simplicity, convenience and versatility without sacrificing accuracy and reliability. The Model "B" has better ultraviolet performance ,.. better resolution . . . better wavelength and photometric accuracy . .. and more freedom from stray light than any other instrument in its field. A descriptive bulletin on the Beckman Model " B " Spectrophotometer will gladly be sent on request. Write today. Beckman Instruments, National Technical Laboratories, South Pasadena 15, California.
INSTRUMENTS
CONTROL MODERN INDUSTRIES
Ç B Meters and (jectrodes —Spectrophotometers — Radiation Meters —Special A n a l y t i c a l
Instruments
